Tesla disclosed its relatively short list of raw battery materials and component suppliers and confirmed plenty of partnerships that have only been rumored so far. The cooperation with Vale is particularly significant, as the Brazilian mining giant has entered a long-term contract with Tesla to ensure an affordable supply of low-carbon nickel.
https://www.notebookcheck.net/Tesla-reveals-its-battery-supply-chain-that-includes-nickel-price-hedges-and-a-solid-state-module-maker.617728.0.html